This issue only reguards the game; Left 4 Dead 2. I have an issue where I cannot join a game that my brother is connected to.
Prior to upgrading from windows xp 32 bit to windows 7 64 bit, I was able to join the same l4d2 server as my brother. We both are on the same network. Now that I have windows 7 64 bit and he still has windows xp 32 bit, I cannot connect to the same l4d2 server as my brother. I receive a message saying failed to connect after x ammount of tries when the lobby leader starts the game. If I join a game in progress, it gives my brother connection problems and lets me in. Vice versa aswell. We both have separate steam account and purchased l4d2 from steam. This issue is only with l4d2. We can join the same team fortress 2 server and other games. What should I do? I have tried running the left 4 dead 2 exe in administrative mode and in windows vista compatibility, xp compatibility, ect and still have this issue. I've tried disabling ipv6 with no luck (by the way can I re enable it again?)